72 TRAVELS THROUQH 



5. yellowifli fand-ftone, hereabout called Ma- 

 cignoi commonly ufed at Bologna in foundations, 

 and columns. The fpfter fort is unfit for architec- 

 ture, as dilTolving in the air. This is very com- 

 inon in the hills near the Apennines, on the road 

 to Florence. The harder and better fpecies is dug 

 2t Pontixano, thirty miles diftant from Bologna ; 

 a fomevyhat fofter near PJancio, fourteen miles 

 diftant j and the fofteft near the city- wall in villa 

 Barbiana ad Scottas. 



6. Geffo Scajola, or S-cagliola, or &apis Specu-r 

 laris, is common in the clay- hills about Bologna. 

 The purer ones are burnt to plaifter, and the 

 coarfer ferve in mafonry. 



7. Red Sal Gemma from Catalonia. 



The library of the Inftitute poflefles a valuable 

 treafure, in the manufcripts of Aldrovandi and 

 Marftgli. A great part of the latter dcfervc pub- 

 liming. Aldrovandfs hand-writing is in fuch fmall 

 letters, and peftered with fo many abbreviations, 

 that it is very difficult to read it. 



The collection of the late celebrated apothe- 

 cary Zannoni, at Bologna, now in the pofleflion 

 of his nephew, contained a great number of petri^ 

 factions, fhells, amphibies in fpirit of wine, ancj 

 large herbary. Several of his fcarcer plants, 

 Jiave been defcribed and engraved, un,der the, 

 title,. Sftrpcs Zannoni cwn Annotationil'UsMontii* 



Among 



